功能：奖励金币改为独立弹窗（展示额度信息）

- 点击「送金币」按钮打开独立弹窗，不再内联在用户名片中
- 弹窗展示 4 格额度信息：单次上限、单日上限、今日已发、剩余额度
- 新增 GET /command/reward-quota 接口（rewardQuota 方法）
  返回当前操作人实时额度，超管返回全部不限
- 发放成功后页面内实时更新今日已发/剩余额度，无需刷新
- 移除原内联奖励面板，action 改为调用全局 openRewardModal()

routes/web.php

@@ -113,6 +113,7 @@ Route::middleware(['chat.auth'])->group(function () {
     Route::post('/command/mute', [AdminCommandController::class, 'mute'])->name('command.mute');
     Route::post('/command/freeze', [AdminCommandController::class, 'freeze'])->name('command.freeze');
     Route::post('/command/reward', [AdminCommandController::class, 'reward'])->name('command.reward');
+    Route::get('/command/reward-quota', [AdminCommandController::class, 'rewardQuota'])->name('command.reward_quota');
     Route::get('/command/whispers/{username}', [AdminCommandController::class, 'viewWhispers'])->name('command.whispers');
     Route::post('/command/announce', [AdminCommandController::class, 'announce'])->name('command.announce');
     Route::post('/command/clear-screen', [AdminCommandController::class, 'clearScreen'])->name('command.clear_screen');